Baffle system for stirling boilers.



D. S. JACOBUS.

BAFFLE SYSTEM POR STIRLING BOILERS.

APPLIGATION FILED JULY 1913.

1,1 32,013. Patented Mar. 16, 1915.

2 SHEETS-SHEET l.

D. S. JACOBUS.

BAPFLB SYSTEM POR STIRLING BOILERS.

APPLICATION FILED JULY 5, 1913.

@$132,013. Patented Mar.16,1915.

l 2 8HEETS4SHBET 2.

JAJA fr0/wey l,

UNITED STATES PATENT FFTCE.

DAVID S. .TACOHUS, GF JERSEY CITY, NEW JERSEY, SSIGNR TO THE BABCOCK WILCOX COMPANY, OF BAYONNE, NEW JERSEY, .A CORPRATON OF NEWy JERSEY.

BAb .ELE SYSTEM FOR STIBLING BOITIERS.,

Application cd July 5, 1913.

To /IZZ wlw/n, it may concern.'

lle it known that I, Divin S. J.\ConUs, a :'tiven of the United States, residing at .lere-,ey City, in the county of Hudson and Siate of New Jersey, have invented certain nea and useful Imprmeinents in Baffie tenis for Stirling Boilers. of which the 'fob lowing?r is a specification,

My invention relate`y to a svsein of special butlles for Stirling boilers and will be understood by reference to the zicmfinpany ing drawings in which-- lineaire l a side elevation, partly in section, of one embodiment of my invention; and Fin'. 2, a similar View of another einboiliment.

Similar reference numerals indicate sinn lar parte in 4the several views.

The present invention is applicable to :i Stirling boiler with two upper steam and Water drums and one mud drum, as well as one having three steam and water drums and orie or two mud drums.

In the forms shown, the numeral l designates the Walls of the boiler setting; 2 the furnace having in Fig.. l a ebnin grate Stoker 3, and in Fig. 2 a Honey stoner; 4, 5 and 6 banks of generating tubes expanded at their lower ends into a mud drum Y and at their upper ends into steam and Water drums 8, 9 and l0 respectively. T bese latter drums are connected by Water circulators 11 and l1', and steam circulators l2 and l2. Coverings of fire bricks 13 resting on the water circulating tubes prevent the .gases passim" above these tubes. A steam main 14 leads rom the central drum 9 to the cross box 15 of a superbeeter placed in the space between the First and second banks of tubes. lin the standard Stirling boiler a baille rests against the rear tubes of the first benk yreachingx from the mud drum nearl)r to the top of the benk, and e second baille rests agninst the rear' tubes of the second bank, reachingI from the center steam and wot/fr drum nearly to the bottom of the bank, these two halles guiding the gases up the first bank of tubes, down the middle bank, and up the rear bank to the outlet flue. To in crease the heat transfer rate and the eiliciency of the` boiler, l have provided the following described systems of balilin" whereby the gases are made to first pas over the upper part of the first bank of tubes and then to flow over the lower Dart Specification of Letters Patent.

AWall .i9 to separate the Patented Mar. ll, 1915.

Serial No. 777,503.

of the irst brink at the back of a vertical `all :it the rear of the furnace, the space at the boel; of the Vall forming a dust pocket which is useful in collecting the dust deposited from the gases.

lVitb moet forms of furnaces for Stirling boilers a tire bri-eli' arch sprung iminei rliately i nt of' the tiret bank of' tubes. auch l' ie ure. however, difiicult to nainiein. as I. re exposed to the high ternne ro me furnace. In the present oonstrnctlon they' :me dispensed with thus lead ing to econmny by eliminating the cost of maintenance, and, at the same time, permit-y ting nn arrangement of bales Whereb7 the portion of the boiler tubes acted upon by the ilirfrt radiant heat of the fire may be at a. groter distance from the `tire than in the usual. form setting.

Referring to Fig. l, the furnace shown has an ignition arch 2.6, and a bridge wall 17 srpportingr a water box' 18, the latter over- 'liang if; the rear of the steker. Supported by le water box, and by brick Work built ofer from the bridge Wall, is a vertical Wall i9 ext .Jing upwardly to the front row of the inst barili of tubes, and from one side vieil ol the setting to the other side wall.. li'i'ol'n the top of Wall 19 a baille Q0 is run across the bank gi, and from the top of this baille an inclined baliie 2l laid on top of the bank, said lastnarned baffle reaching to nearlyY the top of the benk so as to` permit a fuli sweep of the gases across the up per end of the tubes into the secondary eombustion chamber formed between the first an-ffl second banks of tubes. The bafles *2O and 21 forro, in renlitj u continuation of 'first bank into upper and lower portions, faire "ij the. ses to first pass over the upper ion mii then over the lower portion at the rear of wall To censo the rases new downwardly among the tule; of ine midflle or second bank, .incl to cross enti recross the lower por tion of the tubes of the first bank, I introduce the bale Q2 and the cross baille 23. the baffle 22 being a baffle found in the standard Stirling fiesig'n. The rear bank of tubesris shown without cross bules although :the same may be used. In the absence of cross l l "iles, lprefer to introduce the usual shelf extending from the rear Wall of the setting to the tubes of the rea-r bank.

As indimted by the arrows, theygises from the furnace are first directed along and across the tubes of the first bank upon the furnace side of wall 19; thence into the superlieater space and downwardly along the tubes of the second bank; .then across tubes of the first bank and to cross the lower ends of the tubes of the second bank; and then upwardly along the tubes of the tear bank to the stack outlet 25.

As shown in the drawing the topof the wall 19 is a little below the center of the tube length although this exact location of the wall is not material, the essential feature being that the wall shall be so located as to provide a space at the rear thereof to form a dust pocket and to render the lower part of the first bank of tubes effeetivenand thereby .the following advantages may be named.

The portion of the boiler tubes acted upon by the direct radiant heat of the fire is at a I'greater distance from the fire than in most settings, and the trouble often experienced through blistering of the tubes will be minimized. Moreover a furnace is provided in which h'eat is reflected from hot brick work on all sides, thus assisting the combustion and minimizing smoke. In order that the tubes shall be at the proper distance from the surface of the fire with ordinary furnace arrangements, it is often necessaryY to raise the boiler to a relatively high elevation, thus increasinrT the cost of the suspensions and of the brick work. The secondary eombustion chamber between the first and second banks of tubes is also of great advantage in reducing smoke and giving increased eiiiciency.

In the above described construction there is a saving in man v cases as the boiler can be set low with respect to the stoker.

The above described furnace arrangement is applicable to hand firing as well as to all forms of' stokers, and the baffling shown in Fig. 1 susceptible oF modieation. one such modification being shown in Fig. 2. In this embodiment of in v invention the vertical wall 26 rests upon the bridge wall 27 and extends upwardly to the first bank of tubes as in Fig. 1. From the top of the vertical wall 26 a short inclined balile 28 is supported upon the front row of tubes of lthe first bank. and from the end of this short balile a baille 29 is run across the first bank of tubes, permitting, as in Fig. 1. a full sweep of the gases across the top of the bank. The

bailles 28 and 29 form, in reality, a continuation of wall 26 for the same purpose as described in connection with the wall and bafiles of Fig. 1. In some cases the cross baffle 29 would be omitted and the bafiie 28 preferably extended further `upward than shown. Instead of the usual baille resting on the second bank, I have, in Fig. 2, shown a baille 30 resting upon the front tubes of the second bank' and reaching from the middle drum 9 downwardly, an a second -bailie 7c 31 restin upon the rear tubes of the second bank andg reaching from the mud drum 7 upwardly. A cross baille 32 in some cases is end of baille 39 across the space between the first and see-ond .i21- banks for deflecting the ases into the lower part of the first bank. o cause the gases tu cross and recross the tubes of the rear bank. I introduce cross bellies 33, extending later-` ally from baili 31, and shelves or bailles 34 se extending from the rear wall of, the setting, the ases in this arrangement, after leaving the Erst bank,jpass upwardly along the tubes of the second bank, and then downwardly across andl among the tubes of the rear bank 8o to the stack outlet 35.

By dischar ing the gases at a low point lit. the setting adgifantages may be gained where an economizer is attached to the boiler. The outlet may be in the rear wall of' the #et 9i. ting in place of in the floor of the setting. Another advantage secured through a downward flow of the gases over the third bank 0f tubes With cross baliles, is that less soot or ashes will lodge in the cross baflles than will e 1 an upward flow of the gases. and in dustin;r the exterior of the boiler by means 1 steam or air lance the dust will be ua, easily displaced as it wiil naturally be cuiried more readily downward U'Y ll llo (il. im' the gases than it will be carried upward.

By providing a space between the rear ot the vertical wall and the boilerS tubes, any dust deposited from the gases ai this point can be allowed t0 fall into a pocket from whence it can be readily removed. The form of this dust pocket is inunateriaf. :l wide mouthed pocket 36 being shown in liig. 2, whereas in Fig. l the dust pockrt P37 is contracted at the top. In some instances this l "'5 dust pocket may not extend down as tar as the floor level, as for example, in Fig. l the pocket may come at approximatcly the level of the middle of the mud drum 7, or it may be at any other desired height. 5113 The construction above described includes a wall at the rear of the furnace chamber which causes the ases to first pass over the upper part of therst bank of tubes, that is, the gases are caised to travel over the lower part of the first bank of tubes at the rear of the wall after they have traveled over the upper part of the bank. It is not necessary. however, that 'the gases enter at the top of i the first bank. In addition to the baffles 21 and 22 shown in-Fig. 1 on the first bank, there may be an additional baile, supported by the front tubes of the first bank, extend ing downwardly from drum .8 a sufficient distance toward the ton o.wall 19 so as te l (l fi messie cause the gases to enter at the middle part of the bank and to then fiow upwardly over tbe upper part of the bank, and after this to flow over the lower part of the first bant; of tubes.

The baille 20 crossing the first bank of tubes, shown in Fig. l, and baille 29 in Fig. 2, may be built up of a cast iron backing with the front side protected by tiling, or by means of a material introduced in a plastic condition which afterward dries out and be comes bard. The same construction may be used for the bafiles 23 in Fig. l and 32 in lhat I claim and desire to secure by Let-- ters Patent of the United States is l. A. boiler of the class described having a. plurality of banks of tubes, a furnace, a secondary combustion chamber between the first and second banks of tubes, a wall at tbe rear of the furnace chamber extending up-y ward in front of the first bank, and a balile extending parallel with tbe tubes to a point abve the midlength of the tubes andsupported upon the tubes of the first bank, whereby the gases are caused to first enter said bank at the upper part thereof and to cross into Said secondary combustion chamber, substantially as described..

2. iwiler of the class described having a pluralit if banks oftubes, a furnace, a secondary combustion chamber between the first and second banks of tubes, a wall atthe rear of the furnace chamber extending upward in front of the first bank, a baille extending parallel with the tubes to a point above the midlength of the tubes Iand supported upon the tubes of the first bank, whereby the `gases are caused to first enter said bank at the upper part thereof and to cross into said secondary combustion chamber, and a downward extending baiiie atA the rear of the second bank.

3. A boiler of the class described. having a plurality of banks of tubes, a furnace, a secondary combustion chamber between the iirst and second. banks of tubes, a substantially vertical Wall at the back of the furnace chamber and extending upward in iront of tbe first bank, a baille extending parallel with the tubes and supported upon tubes of the first bank near the front of said bank, whereby the gases are caused to first cross the first bank at the upper part thereof and enter said secondary combustion chamber, and a cross balile at the lower part of the first bank to cause the gases to enter the lower part of said bank from the secondary combustion chamber, substantially as described. l

4. A boiler of the class described having a plurality of banks of tubes, a furnace, a secondary combustion chamber between the first and second banks of tubes, a substantially vertical wall at the back of tbe furnace :the :first bank near the chamber and extending 1. the first bank, a ba with the tubes and su reni, weerslag'.

`tweenthe first and second banks of tutu-,szl and a bailie forming an extension ef the wall to cause the gases to flow across the upper part of the first bank directly into said seo ondary combustion chamber, substantiallyl as described.

6. A boiler of tbev serial rnuitiple baniei classdescribed having: a sul'istantially ver tical wall at the back of the furnace chamber and extending upward 'in fri-'at voi? the cross tbe first bank, a secondary combusticn chamber between the first and second banks of tubes, a balile forming an extension of the well for causing the gases to How across the upper part of the first bank directly into said'se@ ondary combustion chai-uber, and a. super heater in said secondary edinbustiou chainm bei', substantially as described.

7. A boiler of the class described having a plurality of banks of tiniest@ nrnace, a sul?,- stantially vertical Wall :mille buck of furnace chamber and extcndin upwerfilin front of the first bank, e ba c extending parallel with the tubes and supported upon tubes of the first bank near the rontitliereof whereby the gases are caused to Erst cross the first bank of tubes at the upper part thereof and enter a secondary combustion chamber at the rear of said bank, a dust pocket at the. rear gf said wall, and a cross baffle at the lowcripart of the first bank tubes to cause the gases to enter the lower part of said bank and to direct any dust if. the ,eases into said picket, substantially as described.

8. A. boiler of tbc class described ccmprising; a plurality of banks of tubes, a wall at tbe rear or'. the furnace chamber to cause the gases to first pass over the 'up r part of the first bank of tubes, and a ba e to cause the gases to then flow across and over the tubes at the lower part of the first bank at the rear of said wall and to recross the same tubes in the" opposite direction, and thence to the second bank of tubes.

9. A boiler of the class described, containing a plurality of banks of tubes extending upward from a mud drum, a wall in front of the mud drum and between it and the furnace chamber, said wall extending upward leaving a dust-collecting pocket at the rear thereof, and bafflesV to cause the gases.l to flow across the upper portion of the first bank of tubes in a secondary cornbustion chamber between thel first and second banks of tubes, and then downward to direct any dust in the gases into said pocket, substantially as described.

10. A boiler of the' class described cornprising three'banks of tubes, awall at the rear of the Afurnace chamber to cause the gases to first pass over the up er part of the first bank of tubes, and ba es to cause the ases to then pass over thelower portion of t first bank of tubes, thence upward over the tubes of the second bank, and lfnallily downward over the tubes of the third 11. A boiler of the class described comprising three banks of tubes, a wall at the rear of the furnace chamber to eausethe gases to first pass over the upper part of the first bank of tubes, baffles to cause the gases t'o then pass over the lower portion of the first bank of tubes, thence upward over the tubes o f the second bank, and cross baffles in the third bank of tubes to cause the gases to cross and recross the tubes as they travel downwardly over the last-named bank.

12. A boiler of the class described comprising'a plurality of banks of tubes, steam and Water and mud drums into which said tubes are expanded, a wall at the rear of the furnace chamber extending upwardly to the first bank, a baflie upon the front row of tubes of'the second'bank and reaching from the middle drum downwardly and a cross bafile extending therefrom among the tubes of the first bank at the rear of said wall, a second baffle resting upon the second -bank and reaching from the mud drum up- Wardly, whereby the gases are caused to first pass over the upper portion of the first bank, then over the lower portion` of the first bank at the rear of said wall, 'thence upwardly over the tubes of the middle bank, and thence downwardly over the tubes of the rear bank.

18. A boiler of the class described, comprising three banks of tubes, steam and water drums and a mud drum into which the tubes are expanded, a wall at the rear of the furnace chamber and a baffle to cause the gases to passover the upper part of the first bank, and baffles to cause the gases to flow downward afterlcrossing the upper part of the first bank, then upward over the tubes of the second bank, and then down- 'ward over the tubes of the third bank, substantially as described.

14. A boiler of the class described, comprising three banks of tubes, steam and water drums and a mud drum into which the tubes are expanded, a wall at ,therear of the furnace chamber, a baiile supported on a row of tubes of the first bank to cause the gases to cross the first bank at the upper part thereof, and baffles to cause the gases to flow downward after crossing the upper part of the first bank, then upward over the tubes of the second bank, and then downward over the tubes of the third bank, sub- 1 stantially as described.

15. A boiler of the class described, comprising a plurality of banks of tubes, steam and water drums and a mud drum into which the tubes are expanded, a wall at the rear of the furnace chamber. and a ballie to cause the gases to pass over the upper part of the fixpt bank, a baille extending along the front of the second bank from the upper end thereof and terminating short of the lower end, and a bafiie extending along the rear of the second bank from the lower end thereof and terminating short of the upper end, substantially as described.

16. A boiler of the class described, comprising a plurality of banks of tubes, steam and water drums and a mud drum into which the tubes are expanded, a wall at the rear of the furnace chamber extending upward to the'first bank, a baflie supported upon the tubes of the first bank, a baffle extending along the second bank from the upper end thereof and terminating short of the lower end, and a cross bafile in the lower part of the space between the first and second banks of tubes, for the purpose described. v Y

17. A boiler of the class described comprising a plurality of banks of tubes, steam arid water drums and a mud drum into' which the tubes are expanded, bafiles tol define the path followed by the gases in passing from one bank to the next and to cause the gases to enter the last bank at the upper part thereof and How downward among the tubes of said bank to the lower part thereof.

In testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

DAVID s. JAcoBUs.

lVitnesses:

M. E. MCNINCH, CHARLES S. JONES. 

